That is so, so true. So many open source software that I'd like to be able to contribute to, if only they would put a Markdown file documenting at a high level

That is so, so true. So many open source software that I'd like to be able to contribute to, if only they would put a Markdown file documenting at a high level how the code is organized, how data flows through it... Instead all we have is the code itself, sometimes some instructions for running the tests and that's it. Then every contributor needs to go through all of the code and reverse engineer it to even start.